Dennis Richie and
Ken Thompson's design of the first version of
UNIX on a PDP-7 marked the beginning of a long
relationship between DIGITAL and UNIX that
continues to the present. In the early 1970s UNIX
was ported to a PDP-11 and in 1983, DIGITAL
developed ULTRIX, its own version of the popular
operating system. Here, Richie and Thompson work
at a PDP-11.